Features: - 18650 3500mAh Protected USB Rechargeable Battery - Cell Used: Quality Lithium ion rechargeable cell - Capacity: 3500mAh - Nominal Voltage: 3.6V - Chemical: Lithium-ion rechargeable cell - Button top - 500 times cycle charge - Min Capacity: 3350mAh - Typical Capacity: 3500mAh - Normal Voltage: 3.6V - Maximum voltage: 4.2V - Standard Continuous Charging Current: 750ma (by USB), 1.0A (by li-ion battery charger) - Maximum Continuous Discharging Current: 8.0A - In Built Safety Circuitry - Protection Circuit (Against over charge, over discharge, over current and short-circuit.) - 4.20V maximum voltage and 2.50V cut-off voltage (by li-ion battery charger) / 5.0V (by USB) - Over 500 charge-discharge cycles - Dimension: Length 70.2mm, Diameter 18.5mm - Weight: 48.0g - Warranty : ONE YEAR warranty from the date of purchase. Overdischarging or battery leakage is not covered nor is fast draining of battery while using. Please keep the voltage of all Li-Ion batteries above 3.8V for healthy storage. Recharge as soon as possible when you have run them down. Storing a depleted ( less than 3.6V open voltage ) battery may damage/ shorten life/cycle permanently. Basically warranty only covers when your battery is above 3.6V however does not produce any power, other than this NO WARRANTY. Package Includes: - 1 x KeepPower 18650 3.6V 3500mAh Li-ion USB Rechargeable Battery P1835U (Ver. 2020)